Duplicating machine



April 16, 1935. E. 1.. WALL 1,997,892

DUPLICATING MACHINE Filed April 12, 1934 4 Sheets-Sheet 1 April 16',1935. E. WALL DUPLICATING MACHINE 4 Sheets-Sheet 2 Filed Apfil 12, 1954m NS 3 9 A and m mm .1 I

Mb m m i I l NB U w SN I I I April 16', 1935.

DUPLICATING momma I Filed April 12, 1954 4 Sheds-Sheet 4 "E. L. WALL I1,997,892

Patented Apr. 16, 1935 DUPLICATING MACHINE Edmund L. Wall, Detroit,Mich, assignor to Rudolph W. Glasner, Chicago, 111.

Application April 12, 1934, Serial No. 720,195

10 Claims.

This invention relates to improvements in duplicating machines of thetype disclosd in my co-pending application Serial Number 518,528,

filed February 26, 1931, and is particularly adapt- 5 ed, though notnecessarily limited in its application, to a horizontal type of boringand milling machine.

More particularly this invention relates to that type of machine inwhich the cutter is controlled by a tracer adapted to follow theprofiles of a relatively soft pattern, and although operating againstsuch a soft pattern is designed to control relatively heavy pressureand, in turn relatively heavy cutting machinery.

Still more specifically, the invention relates to a type of machine ofthis character in which the cutting tool is advanced toward and awayfrom the work by fluid pressure, and which pressure is controlled by thetracer through the medium of an auxiliary valve, the valve operatingautomatically to direct the fluid pressure to one side or the other of apiston which is operatively connected with the cutting tool, with theresult that the pressure operating upon the cutter will be controlledrelatively to the position of the tracer on the pattern.

To the attainment of these ends and the accomplishment of other new anduseful objects as will appear, the invention consists in the fee turesof novelty in substantially the construction, combination andarrangement of the several parts hereinafter more fully described andclaimed and shown in the accompanying drawings illustrating thisinvention and in which Figure l is aview partly in side elevation,partly broken away, and partly in section, of a machine of thischaracter constructed in accordance with the principles of thisinvention.

Figure 2 is a detail sectional view on an en- 40 larged scale, of theauxiliary valve and control mechanism for the cutter.

Figure 3 is a view similar to Figure 2, of the auxiliary valve, on anenlarged scale, showing a portion of the cylinder in which the pistonsthat 45 control the movement of the cutter, operate.

Figure 4 is a view similar to Figure 3', showing the auxiliary valve andothers of the parts in different positions from that shown in Figure 3.

-- Figure 5 is a detail sectional view taken on line 55, Figure 4.

Figure 6 is a view partly in elevation and partly in section, of thetracer.

This invention is adapted to be, applied to any standard drilling orboring machine in which the cutter tool is mounted upon the knee of themachine and is moved toward and away from the work, as well as 'invertical and horizontal directionsby any well known means.

The present invention, however, is more particularly concerned in themovement of the cutter l0 over the work H, and which movement isinfluenced by the operation of a tracer l2 over the surface of a patternl3, the latter being constructed preferably of some soft or cheapmaterial, while the work II is constructed of some hard material. l

In carrying out thB'iDVGIltiOIl, the tracer I 2 is mounted upon a slidel 4 which moves in guides Iii-I6 while the cutter I0 is mounted upon theslide or carriage l1 movable in suitable guides, such as the guide l6and the guide l8. These slides or carriages I 4-41 may be connectedtogether for simultaneous movement in any suitable manner, such as bymeans of a connecting bracket or yoke 19 so that when the slide i1 ismoved forwardly and backwardly the tracer and the cutter will becorrespondingly moved so as to initially position the tracer and thecutter for operation. r

The specific construction of the tracer mechanism constitutes a portionof the subject matter of my co-pending application Serial Number702,039, filed December 12, 1933, but will be described somewhat indetail in order that a complete understanding of the construction andoperation of the same in connection with the present invention, may behad.

The tracer I2 is caused to bear at its point upon the surface ofthepattern 13 by means of a spring 20 which acts through the medium ofinterposed elements and abuts a barrel 2| which is adjustable sotlrat'thetension of the spring may be varied. It is solely the springtension that determines the pressure of the tip of the tracer l2 againstthe pattern |3,.and not the pressure fluid which traverses the tracermechanism and is controlled in its flow by the tracer.

The barrel 2| is screwed into the head 22 which closes one end of thecylinder 23. The other end of this cylinder is closed by a cap 24 whichhas an enlarged opening providing a clearance for the necessary sidemotion of the shank of the tracer l2. f

A combined piston and balanced valve which is the chief element of amovable valve structure, operates in the cylinder 23 between its closedends, and the piston elements are designated by the reference characters25-46. 1 These are integral with the sleeve 21 (which carries a circularvalve plate 28. This valve plate occupies-an 2 annularchamber 29, and itis against one edge 39 of the chamber 29 that the valve plate 29 sits inorder to cut off flow of pressure fluid. The

edge 39 therefore constitutes a valve seat, and the cap 24 which isadiustably secured to the end of the cylinder 23 is additionally usedfor adjusting the valve plate 29 at the seat 39.

An inlet 3| communicates with the chamber 29 and fluid is introducedinto the cylinder 23 between the piston elements 25 and 29 since theupright portions of the element 25 and the plate 29, as well as thatpart of thesleeve 21 disposed ther'ebetween, constitute movable walls ofthe chamber 29, it follows that a movement of the so-called piston orhollow valve 21 may occur to the right or toward the end 22 of thecylinder 23, without the necessity of the valve plate 29 having to actagainst fluid pressure.

In other words, when the valve plate 29 is seated, the various wallsconstituting parts of the element 25, sleeve 21, cylinder l9 and plate24, will confine avolume of pressure fluid which is readily displaced bya movement of the tracer I2 to the right, the only resistance being thetension of the spring 2|.- Therefore, when the tracer encounters araised placein its travel along the pattern l3, the tracer l2 will bedisplaced with the utmost ease. The pressure of the tracer I2 isregulated by the regulation of the spring 29 andthe spring may beadjusted to such a lighttension that even the softest pattern ordinarilyemployed may be traced without imury.

A fluid outlet 32 communicates with-the cylinder 23 on the right side ofthe piston element 29. The base 33, of which a guide stem 34 is a part,is preferably peripherally smaller than the bore of the cylinder 23, sothat there may be no obstruction of fluid flowing through openings 39 tothe outlet 32, and "the base 33 is preferably secured to the piston bybeing screwed thereupon.

A port or opening 39 is provided in the hollow valve 21 to form apassageway for the fluid,

- When the valve plate 29 is unseated from the seat 39 there will be aflow-of fluid from the inlet 3| into the chamber 29, past the valve seat39 and into the cylinder 23, thence through the opening 39 and out ofthe ports or openings 39 to r the outlet 32. A cup 31 is provided with arim having a sharp seating edge 39 bearing against a disc 39 carried bythe tracer l2. Apart of this cup has an, opening 49 which provides adrain passage to accommodate oil seeping past the sleeve valve 21 at theend 29.

There is a separation between the cup 31 and the disc 39 but the twoparts are generally kept in contact by virtue of the engagement of thetracer I2 with the pattern and the pressure of the spring 29in thatdirection. The tendency of the spring is to keep the disc 39 pressedagainst the flange of the cap 24.

' nected to a tube or pipe 49, the latter being connected to the pipe49, and this pipe 49 in turn is connected to the inlet opening 3| of thecylinder 23, and an overflow 41 is connected to the.

pump 42, as a safety for excess pressure, a valve 49 being arranged inthe outlet.

Connected with the outlet 32 ofthe cylinder 23 is a pipe 49, preferablyflexible, which in turn is connected toan exhaust pipe 99, leading backto the sump'4I,

Within the pipe 49 and between the connection 45 and the inlet 3| of thecylinder 23 is arranged a regulator valve 9|.

The cutter I9 is secured to a spindle 92 which in turn is connected tothe boring bar 93 of the machine to which this attachment is applied,and the end of the spindle abuts ball bearings 94, the

latter having a bearing against a thrust, collar 59 secured to the bar53 in any suitable manner.

The boring bar passes through an annular casing 91, and which casingconstitutes an annular cylinder 99 in which a piston preferablycomprising the elements 99-99 operates, and between the piston elementsis arranged opposed cup shaped packing member's. 9|. Connected to thepiston thus formed, are piston rods 92, any number of which may beprovided, and these rods are secured thereto at one end and in anysuitable manner, and pass through packing glands 93. The forward ends ofthe rods are secured to a yoke 94, which in turn is secured to thespindle 52 by a suitable fastening device 95, so that when the piston isreciprocated or moved in the cylinder 58, the spindle'52 andconsequently the boring or cutting tool II) will be correspondinglymoved.

The movement of the piston is controlled by an auxiliary valve 99, whichmoves in a valve casing 91. The valve casing is provided with an inlet99 through the side thereof, and ports 99-19 through the opposite sidethereof, preferably in proximity to the inlet 99, and these ports 99-19constitute both inlet and outlet ports for the fluid, the ports 99-19being preferably separated by means of the wall 1|.

The port 99 leads to the front end of the cylinder 99 by means of apassage 12, and a port or opening 13, while the port or passage 19 hascommunication with a passage 14 which leads to the other end of thecylinder 59 on the opposite side of the piston through the medium of aport 19, so that whenthe fluid is directed from a pipe 19 whichcommunicates with the inlet 99 of the casing 91 and which hascommunication with the pipe 49, and when the valve 99 which operates inI the casing 91 is positioned to direct the fluid through the passage 12to one side of the piston in the cylinder 99, the tool M will beretracted and the fluid on the opposite side of the piston will beexhausted through the passage 14, in a -manner to be described, allowingthe piston'to move towards the other end of the cylinder 99.

When, however, the valve 99 is in a position to cause the fluid enteringthe casing 91 through the pipe 19 to be discharged into the passage 14on the other side of the piston, the'piston and the cutter I9 will bemoved in the opposite direction,

and the fluid in advance of the piston will be ex-' hausted through theopening 13, passage 12 and port or passage 99, in a manner to bedescribed.

It will therefore be manifest that by control of the valve 99, thedirection of movement of the cutter lengthwise of its axis will becontrolled.

The inlet 99 of the casing 91 has communica-- tion with an annularchamber 11, and on each side of the annular chamber 11 and spacedtherefrom are annular ports or passages 19-19 which in turn havecommunication with a passage 99 opening through the casing, and to whichopening is connectif'an exhaust pipe 9| that leads back to the sump 4|either directly or by being connected with the exhaust pipe 99, as at 92(see 7 passages 83-88. The passage 83 has communication with a port 85communicating with the port or passage 10, and the passage 88 hascommunication with a port or passage 88 which in 5 turn hascommunication with the port or passage 88.

The valve 88 is provided with peripheral channels 81-88-88 to form walls80-8I, and the passages 81 and 88 are of a length to form communicationsrespectively, between the passages 18 and 83, 88 and 18, while thepassage 88 is of such a length as to form communication either betweenthe passage 11 and passage 83 or the passage 11 and passage 88,according to the direction of movement or position of the valve 88.

. The walls 80 and 8| of the valve 88 respectively co-operate with seats82-83 and 88-85.

- When the valve 88 is in the position shown in Figure 2, the passage 11will have communication with the passage 88 but as communication betweenthe passage 88 and the passages 83-88 is closed, the fluid will beconfined within the annular passage 11 and cannot escape. 88 is normallyheld in a neutral position or in the position shown in Figures 2 and 4,by means of a spring 88 which encompasses a stem 81 that is secured tothe valve and which passes through a -bearing 88. One end of the spring88 abuts the bearing 88 and the other end abuts the end of 30 the valve88 and tends normally to move the valve 88 forwardly. A spring 88 alsoencompasses the stem 81 on the other side of the bearing 88 and abutsthe bearing at one end and has engagement at the other end with a collarI on the stern. This spring 88 is preferably of a tension less than thetension of the spring 88 and serves the purpose of initially moving thevalve 88 from the position shown in Figures 2 and 3, to the po-' sitionshown in Figure 4, at certain times in the operation of the machine. Atthe time when there is a complete exhaustion of the fluid from thecasing 81 in advance of the valve 88 there would be a tendency forsuction to draw the valve 88 forwardly, which is not desirable andtherefore the spring 88 is provided which overcomes such tendency andrelieves the load thereon. Bumpers or cushions IOI-I02 maybe providedwhich act as shock absorbers to the movement of the valve 88 and thesecushioning elements are mounted upon a rod or bar I03 secured to thevalve 88 and which pass through the bearing 88, the bumpers IOI-I02being arranged on opposite sides of the bearing.

Connected with the pipe 88 (see particularly Figure 1) at a pointpreferablybetween the valve and the inlet 3| of the casing 23 of thetracer, as at I 08, is a pipe I05, which has communication with an inletopening I08 in the valve casing 81. This opening I 08 communicates witha chamber I01 in the valve casing 81 in advance of the valve, a packinggland or washer I08 being preferably provided on the end of the valve88, which abuts an annular flange I08 on the valve, and it is thesuction which has a tendency to be created in the chamber I01 to movethe valve 88 forwardly that the spring 88 is provided to overcome.

When the tracer I2 is in its extreme forward position and'both the"tracer I2 and the cutter-|,0 are out of contact respectivelywith thepattern and the work, there will be exerted the greatest pressure fromthe pump 82 through the pipe 85, pipe 18 and back of the piston in thecylinder 58, moving .the cutter forward to its extreme forward position,and the cutter will be held in such The valve I 3 position under thegreatest pressure because at that time the auxiliary control. valve 88will be in the position shown in Figure 4, and the tracer will be in itsextreme position forwardly as shown in Figure 8.

The fluid under'pressure will then flow from the pump 82, through thepipe 85, past the valve 5|, through the pipe 88, into the opening 33 inthe casing 23 of the tracer and into the chamber 28, where it will beconflned, owing to the fact that the valve plate as is seated uponthisseat 30 to prevent the escape of the fluid from the tracer casing 23. Atthe same time a part. of the fluid under pressure will flow from thepipe 85 into the pipe 18 into the annular chamber 11 of the valve casing81 (see Figure 4), through the port 82, into the passage 83, through theport 85, into the port 10, thence into the passage 18, through theopening 15 and behind the piston 58-80 in the cylinder 58 to move thelatter to the position shown in Figure 4.

When the tracer contacts with the pattern I3 it will be forcedbackwardly, the distance of the movement of the tracer being controlledby the proflle oi the pattern.- As the tracer I2 is forced backward (seeFigure 6), the valve 21 will be moved backwardly against the stress ofthe spring 20 so as to move the valve plate 28 oil of the seat 30,therebyv establishing communication between the chamber 28 in the tracercasing and the port or opening 38 in the valve 21. The fluid will thenflow through the opening 38, out of the openings 35, thence through theexhaust pipe 88-50, back to the sump 8|. Before the tracer I2 is movedbackwardly, shifting the valve 21 to permit the fluid pressure from thechamber 28 to be exhausted, the auxiliary valve 88 will be heldin theposition shown in Figure 4. and against the stress of the spring 88 byreason of the fact that pressure from the pump 82 will be manifestedupon the end of 'the valve 88, through the pipe I05. When, however, thepressure in the chamber 28 of the tracer casing 28 is relieved by themovement backwardly of the tracer I3 so as to permit the fluid to flowout of the exhaust pipe 50,the pressure in the auxiliary valve chamber81 in advance of the valve 88 will be relieved through the pipe I05 andthe valve 88 will be moved forwardly from the position shown in Figure 4to the I position shown in Figure 2, by the spring 88.

thereby establishingcommunicat on between the ports .and passages 88-12and 13 leading to the other.side of the piston 58-80 and the pipe 18 sothat fluid under pressure will flow from the pipe 18 into the annularchamber 11 which now has communication with the port or passage 88,

through the port 88, and the fluid pressure will then be directedthrough the passage 12 and port 13 on the other side of the piston 58-80moving the latter backwardly and with it the cutter I8.

At the same time that communication is established between the annularchamber 11 and the valve casing 81 and the port or passage 88,communication will also be established betwcenthe passages 18-10, port85, passage 18, and exhaust passage with which the exhaust pipe 8|communicates. 4

Similarly, when the fluid pressure is directed behind the piston 58-80to move it forwardly, the fluid in advance of the piston will beexhausted through the passage 13 (see Figure 4), passage 12, port 88,port 88, passage 18, which communicates with the exhaust passage 80, andwhich latter communicates with the exhaust pipe 8|.

pattern IS, the position of the auxiliary valve 66 will be controlled,and in accordance with the position of this valve 66, the movement ofthe piston 596Il will be controlled, and this in turn will move thecutter toward or away from the work H, that is to say the tracer acts toposition or shift the auxiliary valve 66 to control the flow of fluid orpressure in advance of or behind the piston 59--60.

The valve 5! is provided as a pressure control valve by. means of whichthe fluid pressuremay be varied. i

The cutter I0 is rotated in any desired or, suitable manner, such as bymeans of a gear I II! which is secured to a shaft I I I that is rotatedfrom any suitable source of power. The gear H0 is preferably of thebevel type and meshes with a gear I I2 which is keyed or splined uponthe bar or shaft 53, the gear H2 being fixed so that when the'cutter I0is advanced or retracted, the shaft 53 will slide through the gear H2.

' While the preferred form of the invention has been herein shown anddescribed, it is to be understood that various changes may be made inthe i spirit of this invention.

What is claimed as new is:-

1. In a duplicating machine, a work cutter, a piston connected with thecutter, a cylinder in which the piston moves, ports leading into thecylinder on opposite sides ofthe piston, each operating-as a fluid inletand outlet, an auxiliary valve casing constituting with said cylinder aunitary structure, said auxiliary valve casing having portscommunicating with the first said ports, a fluid pressure supply openingtolthe .valve casing, a fluid exhaust from the valve casing, a valve insaid casing, mechanical means tending normally to move said valve in adirection to' establish communication between said fluid opening and oneend of said cylinder and also to establish communication between saidexhaust and, the other end of the cylinder for moving the cutter towardthe work, a. pattern tracer which is subject to vibrations by theintricacies of a pattern, means to supply the fluid pressure tosaidtracer and to one side of the said valve to move the latter against thestress of. the first said means-to cause said valve to establishcommunication between the said fluid opening and the other end of thecylinder and between said exhaust and the cylinder on the opposite sideof the piston, and-means whereby the vibration of the tracerwill'control the operation of said valve.

2. In a duplicating machine, a work cutter, fluid pressure means formoving the cutter towards and away from the work, means embodying areciprocable valve for causing the respective movements of the cutter,mechanical means tending normally to move the valve in one direction,means for directing fluid pressure against the valve to move it in theopposite direction against the stress of the last said means,avibratable tracer movable over a pattern for controlling the operationof the cutter, .means responsive to the vibration of said tracer andoperating to cause the fluid pressure against the said valve to beincreased to move the latter in one direction and to cause such fluidpressure to be reduced to permit the valve to be moved in the oppositedirection, means for creating such fluid pressure, means for varying atwill the said fluid pressure, and means for overcoming suction exertedupon the valve which would have a tendency to prevent operation of thevalve when relieved of the actuating fluid pressure thereupon.

chanical means for moving said valve in one di-' rection, fluid pressuremeans for moving the valve in the opposite direction against the stressofthe last said means, means whereby the vibratory action of said tracerwill control the said fluid pressure, to cause the valve to bemovedthereby against the stress of second recited means, and to reducethe fluid pressure against said'valve to permit the valve to be moved bythe second recited means, means for cushioning the movement of thevalve, said cushioning means embodying a member carried by and extendingfrom the valve, a bearing through which said member slides, and bumperscarried by the member on opposite sides of the bearing.

4. In a duplicating machine, a work cutter, fluid pressure meansoperating to move the cutter in directions both towards and away fromthe work, a valve for controlling the direction of movement of saidcutter under the action of said fluid pressure, a pattern tracer subjectto r I vibratory action as it --moves over a pattern, means for movingsaid valve in one direction, fluid pressure means for .moving, he valvein the opposite direction .jagainst the stress of the last said means,means whereby the vibratory .action of said tracer will control the saidfluid pressure, to cause the valve-to be moved thereby against thestressof second recited means and to reduce the fluid pressure againstsaid valve to permit the valve to be moved by the second recited means,and additional mechanical means operating upon said valve in oppositionto the second recited means .for imparting an initial movement to thevalve against the stress of the first said means at a predetermined timein the operation of the machine.

5. In a duplicating machine, a work cutter, a piston connected with thecutter, a cylinder in which the piston operates, a fluid pressure line,a pattern tracer subject to vibratory action as it moves over a pattern,means whereby the vibrations of the tracer will cause the fluid pressurefrom said line to be alternately directed to opposite sides'of thepiston and correspondingly relieved from the other side thereof, wherebythe cutter will be moved by such pressure towards and away from thework, the said means embodying a valve in the pressure line, meanstending normally to move the valve in one direction against mechanicalmeans for initially moving the valve against the stress of the secondrecited means when the fluid pressure against said Waive is temporarilyreduced to a predetermined point in the cycle of operation of themachine.

6. In a duplicating machine, a work cutter,-'a

3. In a duplicating machine, a work cutter,

piston connected with the cutter, a cylinder in which the pistonoperates, a fluid pressure line, a pattern tracer subject tovibratoryaction as it moves over a pattern, means whereby the vibrationsof the tracer will cause the fluid pressure to be alternately directedto opposite sides of the piston and correspondingly relieved from theother side thereof, whereby the cutter will be reciprocated towards andaway from the work, the said means embodying a reciprocable valve in thepressure line, resilient means tending normally to move the valve in onedirection, said fluid pressure operable to movethe valve in the oppositedirection against the stress of said resilient means, means influencedby the tracer to reduce fluid pressure against said valve to permit thevalve to be moved by said resilient means, and additional resilientmeans operable upon said valve to initially move the valve against thestress of the first recited resilient means at a predetermined time inthe cycle of operation of the tracer.

7. In a duplicating machine, a-work cutter, a piston connected with thecutter, a cylinder in which the piston operates, a fluid pressure line,a pattern tracer subject to vibratory action as it moves over a pattern,means whereby the vibrations of the tracer will cause the fluid pressureto be alternately directed to opposite sides of the piston andcorrespondingly relieved from the other side thereof, whereby the cutterwill be reciprocated towards and away from the work, the saidmeansembodying a reciprocable valve in the pressure line, resilientmeans tending normally to move the valve in one direction, said fluidpressure operable to move the valve in the opposite direction againstthe stress of said resilient means, means influenced by the tracer toreduce fluid pressure against said valve to permit the valve to be movedby said resilient means, additional resilient means operable upon saidvalve to initially move the valve against the stress of the firstrecited resilient means at a predetermined time in the cycle ofoperation of the tracer, and cushioning means for limiting the movementsof the said valve.

8. In a duplicating machine, a work cutter, a piston connected with thecutter, a cylinder in which the piston operates, a fluid pressure line,connections between said line and the cylinder on opposite sides of thepiston to reciprocate the latter, a valve in the line for controllingthe direction of flow of the fluid with respect to the cylinder,resilient means for moving the valve in one direction, means whereby thefluid pressure will the tracer to cause fluid pressure to be relievedfrom said valve to permit the valve to be moved; by the said resilientmeans, and additional mechanical means operable upon said valve forinitially moving the valve against the stress of the said resilientmeans to overcome suction on the valve created'by the relieving of thefluid pressureon the valve.

9. In 'a duplicating machine, a work cutter movable in directionstowards and away from the work, a pattern tracer subject to vibratoryaction as it moves over a pattern, a pressure fluid system including acylinder and piston for utilizing the pressure to move the cutterin'directionstowards and away from the work, means controlled by thevibrations of the tracer to variably control the flow of, fluid to thecylinder and to control the direction of flow of fluid into the cylinderto cause' the active pressure of the fluid to be transferred from oneside to the other side of the piston, the said means embodying adistributing valve, means tending normally to move the valve in onedirection, the said valve being operated upon by said fluid pressure tomove the same in the opposite direction against the stress of the lastsaid means, and means in addition to said fluid pressure for moving thevalve against the stress of the last recited means.

10. In a duplicating machine, a work cutter, a piston connected with thecutter, acylinder in which the piston operates, a fluid pressure line, apattern tracer subject to vibratory action as it moves over a pattern,means whereby the vibrations of the tracer will cause the fluid pressureto be alternately directed to opposite sides of the piston andcorrespondingly relieved from the other side thereof, whereby the cutterwill be reciprocated toward and-away from the work, the said meansembodying a reciprocable valve in the pressure line, resilient meanstending normally to move the valve in one direction, said fluid pressureoperable to move the valve in the opposite direction against the stressof said resilient means, means influenced by the tracer to reduce fluidpressure against said valve to permit the additional mechanical meansoperable upon said valve to initially move the valve against the stressof the said resilient means at a predetermined time in the cycle ofoperation of the tracer.

EDMUND L. wALIL.

.valve to be moved by said resilient means, and

